I was allowed to drink cider on Saturday night (usually whilst we watched Match of the Day) from about 13 or 14; and wine with Sunday dinner from 15. But oddly I wasn't allowed beer at home until after I had the first one in the pub that night; after that Dad and I would go to the pub occasionally (probably once a month) for a couple of beers and a game of bar billiards.I was able to drink in our house once we (I have two brothers) turned 13. That was long ago.
One abiding memory of pubs at an early age was going to one of the village pubs with my girlfriend whilst we both 17. We used to take her Pyrenean Mountain Dog which took up most of the floor in the bar! I'm pretty sure the landlord knew we were both underage too but he never challenged us.